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                               March 19, 2024

       Douglas K. Howell
       Chief Financial Officer
       Arthur J. Gallagher & Co.
       2850 Golf Road
       Rolling Meadows, IL 60008-4050

                                                        Re: Arthur J. Gallagher 
& Co.
                                                            Form 10-K for the 
Fiscal Year Ended December 31, 2023
                                                            File No. 001-09761

       Dear Douglas K. Howell:

              We have limited our review of your filing to the financial 
statements and related
       disclosures and have the following comment.

              Please respond to this letter within ten business days by 
providing the requested
       information or advise us as soon as possible when you will respond. If 
you do not believe a
       comment applies to your facts and circumstances, please tell us why in 
your response.

                                                        After reviewing your 
response to this letter, we may have additional comments.

       Form 10-K for the Fiscal Year Ended December 31, 2023

       Notes to Consolidated Financial Statements
       5. Change in Presentation of Fiduciary Assets and Liabilities, page 89

   1.                                                   We note your disclosure 
that you revised your balance sheet and statement of cash flows
                                                        presentation to 
separately identify and present fiduciary assets and liabilities and that you
                                                        also made certain 
revisions to fiduciary balances related to the former Willis Re
                                                        operations from gross 
to net presentation to align with your accounting policy and
                                                        presentation. For each 
change and revision reflected in the financial statements, please
                                                        address the items 
below.
                                                            Clarify whether you 
concluded that your prior presentation (e.g., gross to net,
                                                             statement of cash 
flow classification, etc.) was an error and how you considered ASC
                                                             250 in your 
determination.
                                                            To the extent 
applicable, provide us with a detailed description of any error(s),
                                                             including but not 
limited to who identified them, when and how, whether they were
                                                             the result of 
control deficiencies, as well as your assessment of materiality,
                                                             individually and 
in the aggregate, that addresses both qualitative and quantitative
 Douglas K. Howell
Arthur J. Gallagher & Co.
March 19, 2024
Page 2
              factors and consideration of guidance in ASC 250, SAB 99, and 
management's
              assessment of design and effectiveness of ICFR.
                Provide us with an accounting analysis, citing authoritative 
literature, explaining your
              presentation before and after implementing these changes to your 
presentation. For
              example, explain why net change in fiduciary assets and 
liabilities appears to have
              moved from operating activities to financing activities within 
the statement of cash
              flows.

       In closing, we remind you that the company and its management are 
responsible for the
accuracy and adequacy of their disclosures, notwithstanding any review, 
comments, action or
absence of action by the staff.

       Please contact Cara Lubit at 202-551-5909 or Robert Klein at 
202-551-3847 with any
questions.



FirstName LastNameDouglas K. Howell                             Sincerely,
Comapany NameArthur J. Gallagher & Co.
                                                                Division of 
Corporation Finance
March 19, 2024 Page 2                                           Office of 
Finance
FirstName LastName